<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

</head>

<body>

</body>

</html>
<script>
    // 题目1: 对字符串进行排列组合, 得到所有字符的全排列组合(假设所有字符不重复)
    // 函数名：permutation
    // 参数：需要排列组合的字符串
    // 返回值：字符串的所有排列组合数组
    // 例如：permutation("abc") 返回 ["abc", "acb", "bac", "bca", "cab", "cba"]
    var perm = function (s) {
        var result = [];
        if (s.length <= 1) {
            return [s];
        } else {
            for (var i = 0; i < s.length; i++) {
                var c = s[i];
                var newStr = s.slice(0, i) + s.slice(i + 1, s.length);
                var l = perm(newStr);

                for (var j = 0; j < l.length; j++) {
                    var tmp = c + l[j];
                    result.push(tmp);
                }
            }
        }
        return result;
    };
    let a = perm("abc");
    console.log(a);
</script>